User manual

ManualsBrandsGIGAHERTZ SOLUTIONS ManualsRadiation MeasurementHF58B-r -Analyser, Electric smog meter,

Digital High Frequency Analyser HF58B-r

Quantitative Measurement:

Determination of Total High Frequency

Pollution

As described in Getting Started, attach the

LogPer antenna to the HF analyzer. Hold

the HF analyzer with a slightly outstretched

arm because objects (mass) directly behind

it “like yourself”, have effects on the testing

result. Your hand should not get too close to

the antenna, but should be near the bottom

end of the instrument.

In the area of a local maximum, the posi-

tioning of the HF analyzer should be changed

until the highest power density (the most im-

portant measurement value) can be located.

This can be achieved as follows:

- When scanning “all directions“ with the

LogPer to locate the direction from which

the major HF emission(s) originate, move

your wrist right and left. For emission

sources behind your back, you have to

turn around and place your body behind

the HF analyzer.

- Through rotating the HF analyzer, with at-

tached LogPer antenna, around its longi-

tudinal axis, determine the polarization

plane of the HF radiation.

- Change the measurement position and

avoid measuring exclusively in one spot..

because that spot may have local or an-

tenna-specific cancellation effects.

Some manufacturers of field meters propa-

gate the idea that the effective power density

should be obtained by taking measurements

of all three axes and calculating the result.

Most manufacturers of professional testing

equipment, however, do not share this view.

In general, it is well accepted that

exposure limit comparisons should be

based on the maximum value emitted

from the direction of the strongest

radiation source.

But the details of the situation need to be

considered! For example, if a 2.4-GHz tele-

phone inside the house emits a similar level

of microwaves as a nearby cellular phone

base station outside the house, it would be

helpful to first turn off the 2.4-GHz telephone

in the house. Now measure the exposure

level originating from the outside. After hav-

ing measured the emission of the 2.4-GHz

telephone on its own, the sum of both meas-

urement values could be used for the expo-

sure assessment.

There is no “official regulation” nor clearly

defined testing protocol, because according

to German national standard-setting institu-

tions, as described earlier, quantitatively reli-

able, targeted and reproducible measure-

ments are only possible under “free field con-

ditions“ but not in indoor environments.

Cellular phone channel emissions vary with

the load. The minimum HF level occurs,

when only the control channel operates. It is

suggested that measurements should be

taken at different times during the day / week

in order to find out the times of highest traf-

fic.

Quantitative Measurement:

Special case 1: UMTS / 3G

(Universal Mobile Telecommunication Sys-

tem, also known as the third generation of

mobile phones.) This technology is designed

to process huge amounts of data and has a

narrowly meshed network.

For measuring UMTS/3G the switch “Low

Frequency” Video Bandwith should be set to

“TPmax”.

With LogPer aerial and in “Peak “ mode iden-

tify the main direction of the signal and

switch to “ Peak Hold – long”

Now “gather“ the highest value without mov-

ing the meter ( use a wooden tripod ) for at

least 2 minutes in the same position. This is

important as because of the signal character-

istics of the UMTS/3G signal fluctuations by

the factor +/- 6 are common.

To hear samples how a UMTS/3G signal

sounds in the audio-analysis please check

our website for links to MP3 files.

Please note that when measuring UMTS/3G

you should not

use the combination of

switch-positions ”Average” and

“Pulse” .